Sack-stretching machine.



A. V. JENSEN.

SACK STHETCHING MACHINE.

APPLICATION FILED DEC. I7, 1914.

Patented 001;. 12, 1915.

2 SHEETS-SHEET I \\\\\\\\\ulll/////Z E A. V. JENSEN.

SACK STRETCHING MACHINE.

APPLICATION FILED DEC. I7. I9I4.

Pand 0013.121915.

2 SHEETS-SHEET 2.

lltfl.' j.

CDLUMBM PLANOORAPH co.,wAsMlNu-rN. b. c.

erm,

ALEXANDER v. JENSEN, or DEvILssLInE, Uren.

intense.,

resident of yDevils Slide, Morgan county',

Utah7 have invented certain new and useful :improvements inSack-StretchingMachines, of which the following is a specification.

This invention relates to a machine for stretching sacks. and similararticles. In many industries the products are shipped in sacks and forbusiness reasons certain standard sizes of ysacks havebeendeterminedupon to contain certain fixed standard quantities ofmaterial measured by weight or volume, for example, cement is shipped insacks supposed to contain ninety-five pounds of ce ment. Itis obvious,however, that if for any reason the sacks shrink, they cannot hold therequired standard quantity of material and the result is, that sacks,otherwiseusable, are discarded and' thus represent a serious loss. Tnsome instances a cement mill or other factory may have several hundredsof thousands of good sacks, which cannot be used because they haveshrunk so'y much that they cannot hold the required quantity ofmaterial. The reasons' forr `the shrinkage `are several. Thus in thecement industry'the sacks are freouientlyy used as coverings for newwork and are therefore exposed to the weather and moisture, and it hasbeen found that even pre-shrinking the sacks is insufflcient becausethey become still more wet and shrink still further when yused on ythework. Tf a large sack were used'and the required quantityfilled into it,the sack wouldY appear not filled, ywhich is not desirable and ofcourse, this remedy would not yaffect the sacks now in usefor kdiscardedbecause'of the shrinkage. y

The object of this invention istherefore to provide a machine orapparatus for the stretching 'of sacks to standard or desired size inaneflicient manner whereby to avoid the loss due to shrunken sacks andwhereby discarded sacks may again be usable. The economic advantages ofsuch machine `or appar'atusare obvious iny viewof the "foref goingexplanation.y 7 Y i Withthis and other objects infview the invention'ris yembodied in a sack stretching machine as hereinafter gdescribed andclaimed, and as illustrated the accompanying drawings in which; n"Figure" 1 is rear view of-abattery ,of sack stretchingimachinesembodying the ine e Specification 'ofiLetters Yatent Patenten eet., ti2,relis.

Application filed December 17, 1914. Serial No. 877,660. i

vention and driveny from acommon source of power; Fig.,2 is a side yviewlooking from the yleft in Fig. 1; Fig; 3 is a front view 'or t view ofthe operators side of a singlema-y chine; and Figsf and 5 are detailviews of the stretching` rolls. i i n i `Preferably several sack'ystretching .ma-k chines are mounted upon acommon framework and drivenfrom a common source of power which in this instance is represented bythe motor shaft 2 throughgears 3 and f1. The shaft2 is supported insuitable bearings on thefgeneral framework yor machine supporting means5.

1 which drives a` main orline i The machines arealike and each one com-Vi prises a xed frame 6, 'in which there are ,f mountedtwo sackstretching rollers 7,y and 8.

The roll 7 is mounted in a fixed bearing9 at thetop of thev machine,while the roll 8 is mounted in a movable bearing 10 which Slides in theyopening 11 in the frame To each of the `rolls 7 and 8f there issecured` a gear 12 and 13 respectively which are driven inthe same'direction by gears 14 and 15 meshing with said gears 12 and 13. gearllt is secured yto the upright shaft 16v andthe gear 15 is indrivingengagement with said shaft by a spline 17 or othersuitable means.The gear 15 is rotatably held to The the movable bearing 10 by suitablejaws 18 i operating Athe The upright shaft 1G is ournaled inbear- Y ings23 and 2e and carries'a gear 25 which is driven from a gear 26 on theaforesaid main or line shaft 2. f

follows then scription that when line shaft 2Vdrives the-upright shafts16 from which the rollers' 7 and 8 are rotated. When a sack i's to bestretched, it is' first i from the foregoing de-` the'motoris startedthe thoroughly soakedin water. Thereafter the y operator takes the sack,depresses the treadle 20, thereby lifting the roll 8 and decreasing thedistance then slips they sack 100 over both rolls and lets goof thetreadle. 'stretchedr like 'a belt over the rolls 7 and'f8 betweentherolls k7 and 8. yHe

The sack is rnow y `mounting the sack on the stretching rolls 2dov andsupports the weight of the bearing l() and all the parts thereon. rIhisoperation of may be performed whether the rolls 7 and 8 rotate or not.In either case the sack is easily mounted for stretching.

stretched by the weight of the lower roll and bearing l0 and is run overthe rolls in the same manner in which abelt runs over its pulleysl andso that the fabric ofthe sack may be evenly stretched all around.V Incase the weight of the lower Vroll 8 is not suf- 'cient to completelystretch the sack, a spring,-

30 may be used asv shown and which urges the bearingl downwardly, itsupper coil acting against a washer 29 adjustably secured to the shaft 16by a set screw 3l and whereby the tension of the spring may beadjusted., Preferably another spring V32 is used'beneath the bearing l0to help Vbalance the force of the spring 30. The spring 32 acts againstan adjustable washer 33.

Means are also provided whereby the operator is venabled to setl thelower roll 8 at a predetermined distance from` the upper roll 7 tostretch a sack to a certain size. Y On the framework 5 there is pivotedat 35 a gage plate 36 operable by means of .a handle 37. 0n vthe treadleis placed a stop 38. The gage plate may be marked as shown for differentsizes of'sacks. It is obvious, that when the operator` takes his footoff` the treadle, the latter will move up under the weight of'roll 8 andbearing l0 acting on the lifting rod 22, until the stop 38 strikesagainst'the gage plate v36, and of course vthe roll 8 ycannot move downany farther. In this casethe springs 30 and 32 also assist in Yeasingthe strain on the sack. Any suitable means for maintaining the gageVplate in its various positionsmay be used and are not shown.

, vIn korder to properly and quickly f stretch the sack it is necessarythat some means be employed to assist and furtherthe evaporationvof theliquid into which the sack was soaked before being mounted on the rolls.For this purpose heat is applied either directly or indirectly. If thelatter method is preferred, the operation may take place in warm roomandblasts of hot air may be directed toward the sack while it is ontherolls. lItis not necessaryto illustrate apparatusfor this purpose, as itis similar to that which' is used for the operation of socalleddrying'rooms and wellpknown. I

prefer, however, the application of direct heating means asaccomplishing the result most quickly and economically. Referring to Fig. 4 which shows a construction suitable for drying the sacks by meansof electricity applied to` a heating coil, the stretching roll is shownprovided with a socket member 39 of insulating kmaterial and providedwith When the operator lets goof the treadle the sack is" latingmaterial.

yinsulated from the roll which preferably is made from steel tubing. Theheating eleyment comprises a hollow cylindrical base 44 provided withheads 45 and 46,"all of i'nsun VThe head 46 is provided with two contactpins 47 and 48 adapted to be thrust into the contact sockets 40 and 4l.The terminals of the heating coil 49 are connected to the contacts 47and 48. Thus itrwill be observed that the heating element is detachablefrom the roll `as shown in Fig.

4. In order to connect the coil 49, the-heat? ing element is moved fullyinto the roll when thecontactpins will enter the contact sockets.lurrent is supplied to lthe commutator rings by brushes 50 and 5l towhich the cables 52 from a suitable source of current are connected. Theshaft 55 for driving thev roll is connected to the latter by Y screws orpins and is cut out as at- 56, 56,

to leave room for the wirestto the commutator rings.

In case steam is'preferred, or hot water,

used, in which `6() represents a suitable supthe construction showninTig. 5 may be f portingv means for the stationary steam pipes 6l whichpass through the shaft 55 and into the roll forming a suitable steamcoil 62.V In either case it will be observed that the, sack will beheated while being stretched so that the operation will take but a shorttime. c

The machine as here described is very simpleand easily operated. One mancan attend to a battery of machines and manipulate eachcmachineindependently of the others by Ysimply operating `the. treadle, therebyworking the rolls without stopping their rotation, nor necessitatingvcuttingoff the heat.,

kIt will be seen that the machine comprises suitable stretching meanstogether with means for heating the same and the necessary adjustingmechanisms. v'

.Details in the construction mayvary and I do not intend limiting myinvention to v the precise disclosure, nor to the stretching of sacksonly, but I claim all such modications as properly come within theprinciple Of the invention andthe scope of the apsV pended claims.

`Iclaimv: Y Vl'. In a sack stretching machine the combination of a `pairof rolls adapted to receive the sack to be stretched, meansl for:heating said rolls, means for Voperating one of the rolls toward andaway from they other roll and means for rotating the rolls. 2. In a sackstretching machine, the combination of a pair of rolls adapted toreceive the sack to be stretched,means for-heating Y said rolls, meansfor rotating said'rolls inf inside the ysack and whilesaid rolls are rotated.

3. In a sack stretching machine, the combination of a plurality of pairsof rolls, each pair being adapted to receive a sack to be stretched,means for operatingthe one rol. in each pair of rolls independently ofthe other pairs oit' rolls to permit a sack to be drawn over said pair,means for hea-ting the rolls and means for rotating the same.V

d. In a sack stretching machine the combination of a pair of rollsadapted to receive the sack to be stretched, one of said rolls beingoperable toward and away from the other roll7 means for adjusting theextent of the movement of the one roll away from the other roll andmeans for operating the said rolls.

5. ln a sack stretching machine the combination of a pair of rollsadapted to receive the sack to be stretched, one of said rolls beingoperable toward and away from the other roll, means fory adjusting theextent of the movement of the said one roll and means for operating therolls. f

G. In a sack stretching machine the coinbination of, a pair of rollsadapted to receive the sack to be stretched, means for diminishing thedistance between the rolls for drawing the sack upon the same, means foroperating one ot' said rolls away from the other roll to stretch thesack, means for limiting the movement of the said one roll, means forheating the rolls and means Afor rotating the same.

7. In a sack stretching machine the combination of a frame, a stationaryroll mounted to rotate therein, a movable bearing opies of this patentmay be obtained for ve cents each, by addressing the Commissioner ofPatents, s

mounted to slide in said frame, ra second roll mounted to rotate in saidbearing, means i for moving the said bearing toward the said stationary'roll to diminish the distancer between the said rolls for drawing asack upon the same, means for rotating the said rolls and a spring forforcing the said bearingv and the said second roll away from the saidiirst roll to stretch the sack upon the rolls.

8. In a sack stretching machine the combination of a frame, a stationaryroll mounted to rotate therein, a. movable bearing mounted to slide insaid frame, a second roll mounted to rotate in said bearing, means Jformoving theA said bearing toward the said stationary roll to diminish thedistance between the said rolls for drawing a sack upon the same, meansfor rotating the said rolls and a spring for forcing the said bearing,and the said second roll Vaway from the said first roll to stretch thesack upon the rolls, and means for heating the latter.

9. In a sack stretching machine the conibination of a plurality of pairsof rolls, each pair being adapted to receive a sack to be stretched,means for operating the one roll in each pair of rolls independently ofthe other pairs of lrolls to permit a sack to be drawn over said pair,means for increasing the distance between the rolls in each pair ofrolls independently of the other pairs, means for heating said rolls anddriving means for rotating all of the said rolls.

Signed at Devils Slide, Morgan Co., this 9th day of December7 1914.

ALEXANDER V. JENSEN.

Vitnesses:

T. L. BALL, EDWIN A. WILDE.

c Washington, D. C.

